Dimercaprol [DYE-mer-kah-prawl] reacts with Lewisite in one type of this reaction, used to treat mustard gas poisoning in World War I. "Agents" that promote this kind of reaction include siderophores [SID-er-uh-forz], porphyrins, and EDTA. This kind of reaction is almost always more thermodynamically stable than adding an equivalent number of monodentate ligands. For 10 points, name this reaction in which a single ligand forms several bonds with 
Dimercaprol [DYE-mer-kah-prawl] reacts with Lewisite in one type of this reaction, used to treat mustard gas poisoning in World War I. "Agents" that promote this kind of reaction include siderophores [SID-er-uh-forz], porphyrins, and EDTA. This kind of reaction is almost always more thermodynamically stable than adding an equivalent number of monodentate ligands. For 10 points, name this reaction in which a single ligand forms several bonds with a metal ion to form a certain type of coordination complex.
Dimercaprol [DYE-mer-kah-prawl] reacts with Lewisite in one type of this reaction, used to treat mustard gas poisoning in World War I. "Agents" that promote this kind of reaction include siderophores [SID-er-uh-forz], porphyrins, and EDTA.
{chelation} [{KEE}-{lay}-{shun}] [or word forms, {such} as {chelate}]